Heating-furnace



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(No Model.) 2 Sheets-Sheet 2.

J. N. HERSH. HEATING FURNACB.

N0.'46o,811. Patnted oct. 6, 1891.

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NITED STAT-Es PATENT OFFICE.

JAMES N. HERSII, OF ALLENTOVN, ASSIGNOR TO IIIMSELF, AND IVILLIAM R. BUTLER, OF MAUCII OIIUNK, PENNSYLVANIA.

HEATING-FURNACE.

SPECIFICATION forming part of Letters Patent No. 460,811, dated October 6, 1891.

Application filed February 16, 1891. Serial No. 381,632. (No model.)

T0 all whom t may concern:

Be it known that I, JAMES N. IIERsH, a citizen of the United States, and a resident of Allentown, Lehigh county, Pennsylvania, have invented certain Improvements in Heating-Furnaces, of which the following is a specification.

The object of my invention is to provide a simple and economical form of circulating device for the products of combustion in a hot-air furnace; and this object I attain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which- Figure 1 is a vertical section of a heatingfurnace constructed in accordance with my invention. Figs. 2 and 3 are transverse sections, respectively, on the lines 1 2 and 3 4, Fig. 1. Fig. 4 is a sectional plan view on the line 5 G, Fig. 1, and Fig. 5 is a sectional plan view on the line 7 8, Fig. 1.

A is the outer casing of the furnace, mounted upon a suitable base A', upon which is also mounted the ash-pit casing B, which snpports the lire-pot D, and above the latter is mounted the combustion-chamber F, closed at the top by a dome-like cap or cover F. Wvith the tire-pot communicates the feed chtite or hopper G, which is provided with a suitable door G', and at the rear of the lirepot is the outlet-Hue II, direct access to which from the combustion-chamber can be prevented by means of the damper d. The outlet-flue H also communicates through a depending pipe 1-I and elbow-neck I with the ash-pit of the furnace, this communication being cut olf, when desired, by means of the damper I), the pipe Il', and neck I, forming the usual dust-flue.

Mounted in the upper portion of the hot-air chamber within the casingA is an annular drum J, consisting of inner and outer rings d, applied to annular flanged top and bottom plates fand g, and this annular' drum is supported upon pipes MNand M4N4,the pipes M N project-ing upward from suitable necks i, formed ant the opposite sides of the feed-chute G, and the pipes MA1 N 4 being applied to similar necks m, formed at the opposite sides of the discharge-flue H. Depending from the annular drum J, on opposite sides of the combustionchamber casing F, are pipes M2 M2 and N2 N2, each pair of pipes being connected at the bottom by a return-bend P, and in the drum J, between the pipes M2 M3 and between the pipes N2 N2, are transverse partit-ions 7i, which thus divide said drum into front and rear chambers, the front chamber communieating with the pipes h M2 and N N2 and the rear chamber communicating with the pipes MS M4 and N3 N 'L Vhen the damper d is closed, therefore, the products of combustion are compelled to `take the coursc'indicated by the arrows in Fig. l-that is to say, they rise through the pipes M N', traverse the front half of the drum J, descend through the pipes M2 N2, pass through the returnbends l), ascend to pipes M2 N3, traverse the rear half of the drum J, and descend through the pipes M'l N'1 to the discharge-fine Il. By this means an extended circulation of the products of combustion is insured throughout all portions of the air-heating structure of. the furnace, and a great portion of this circulation is downward or in opposition to the natural rising tendency of the heated products of combustion. IIence said products cannot traverse the pipes and passages so rapidiy as to escape before their heat has been thoroughly utilized.

The construction of the circulating device is also of a simple and inexpensive character, said circulating device being composed mainly of pipe-sections, which can be readily fitted to the necks of the feed-chute, dischargeflue, and connecting-drum.

I am aware that air-heating furnaces have been provided with upper and lower drums connected by pipes, some of which form as` cending nues and others descending ues, and hence I do not claim such broad construe tion; but

I claim as my invention and desire to secure by Letters Patent- The combination of the lire-pot having a feed-chute at the front and t discharge-Hue at the rear, a closed combustion-chamber casing` mounted on said lire-pot, an annular drum located in the upper portion of the air-heatin g chamber and divided by transverse partitions into front and rear chambers, ascending lines connecting the front chamber of said drum IOO with the feedchute at the front of the firepot, descending fines connecting the rear chamberof the drum with the dischargelue at the rear of Jche re-pot, and descending and ascending flues arranged in pairs on opposite sides of the fire-pot, the fines of each pair being connected at the bottom and one iue 0f each pair communicating at the top with the front chamber of the annular drum and the other with the rear Chamber of lche same, subxo stantiaily as specified.

In testimony whereof I have signed my name to this speeic-ation in the presence of two subscribing witnesses..

\ JAMES N. HERSH.

Witnesses:

L. H. BARBER, F. LEIBOTH. 

